Clevis joint



z Mrch 2l, 1944..

F. w. N. DUFFu-:LD ET AL 2,344,808

CLEVIS JOINT Filed March 3, 1943 5y/1..;zgf`@ numerals have beenemployed to designate like Patented Mar. M, 944

CLEVIS JOINT Francis Walker Norman Dumeld. Barr Common, near Walsall,and Patrick James Hargreaves Riley, Birmingham, England ApplicationMaren s, 1943, sei-isi No. 477,384 in Great Britain July 31, 1941 8Claims.

This invention has reference to clevis joints.

such as used in automobile braking systems for uniting two lengths ofpower-transmitting rodding.

One object of the present invention is to prevent, or reduce to aminimum, the occurrence of rattling by impingement of one member of aclevis joint upon another.

VAnother object of the invention is to enable any play which may be setup between the various component parties a result of wear, to be takenup automatically Another object is to facilitate the assembly of aclevis joint.

Another object is to reduce the possibility of the joint making pinbeing dropped inadvertently during the assembly of a joint or slippingout of the joint after assembly, for instance when a road vehicle is inmotion.

Further objects o! the invention will be apparent from the followingdescription.

In the accompanying drawing forming a part this specification andwherein like reference parts throughout the several views Figure 1 is aside elevation, partly in section, of a clevis joint embodying thepresent invention,

Figs. 2 to 5 inclusive are similar views illus trating alternative ormodied lforms of the clevis joint shown in Fig. 1,

Fig. 6 is a side elevation, partlyin section, of a clevis Joint of thegeneral type illustrated in the preceding iigures but showing the use ofa dished metal spring as a substitute for the coil spring shown in Figs.1 to 5 inclusive, and

ittube Fig. 7 is a plan view of the dished metal spring Y illustrated inFig. 6.

The joint shown in Figure 1 comprises a bifurcated clevis I, the twoarms or sides 2 and l of which are pierced to enable it to receive a pin4 for coupling the eyed end of a rod 5 to the clevis. The arm or side 2is drilled and tapped to produce an enlarged screw-threaded aperture 8concentric with the piercing l in the arm I.

,A spring-loaded plunger, consisting of a metal cup l.. is so carried bythe arm or side 2 of the clevis that its acts on the end of the rod 5and thrusts the latter against the arm l, thus preventing rattle betweenthe rod and clevis.

I'he plunger forms part of an assembly embodying a plug l which isscrewed into the aparture I and a coil spring I0 located between, andpreferably secured atits ends, to the cup and plug. The cup and plugareapertured to permit of the pin being passed through the assembly, to

eiect the coupling between the clevis l and rod only be moved a shortdistance from the clevis arm 2, the outer edge of the aperture 6 may beburred over to prevent the inadvertent removal of the plug by vibration.If desired, grease may be packed between the cup and plug.

The joint between the clevis l and rod 5 is eected by connecting the'plug and plunger assembly in the aperture 6 and forcing the end of therod between the cup and clevis arm 3 until the eye therein registerswith the piercing 1 in the latter, and the apertures in the plug andcup; the coupling pin may then be passed through both clevis arms inwhich position it is retained by the cotter or split pin.

In the modified and simplined joint shown in Figure 2, the plus 9 isdispensed with and the head I2 of the pin 4 is screw-threaded to enableengaged with the enlarged aperture in the clevis arm 3, Also the springi0 is arranged to act directlyon the eyed `end of the rod 5 instead ofthrough a plunger. The pin head I2 is preferably formed with means, suchas a transverse slot, to enable it to be engaged by a tool duringassembly.

'Ihus the number of parts in the joint is reduced to a minimum and costsof production are consequently reduced.

To facilitate assembly, and at the same time reduce the possibility ofthe spring l0 being mislaid, the pin I is provided adjacent its head,with a collar or enlargement I3, thereby producing a peripheral grooveor neck I l between the collar and head. The spring is forced over thesaid collar so that its end coil engages the groove and retains thespring upon the pin. Preferably the coil at the other end of the springis in the form of an unbroken ring, the outer surface of which isattened to provide a smooth face for contacting the rod 5.

The Joint is effected simply by inserting the rod I between the arms 2and 3 of the clevis, and passing the pin and spring assembly through theenlarged aperture in the arm 2, the eye in the rod 5 and the piercinginthe arm 3. Since the eye and piercing are of substantially the samediameter as the shank of the pin, the spring impinges against the rodand is compressedby the screwing of the head it into the enlargedaperture. The pin is preferably retained in position by a pin which ispassed through a hole I I in the end of the said pin.

The joint shown in Figure 3 diiers from that shown in Figure 2 only inthat the shank of the pin d is provided with a shoulderi adjacent :itsouter end, Which shoulder is adapted to abut against the clevis arm 3and serve as a stop for preventing the pin head being screwed too farinto the enlarged aperture in the arm 2.

In the joint shown in Figure 4, the pin d is formed with a smooth headwhich is provided with one or more radial pins adapted to engagecomplementary bayonet slots I6 in the enlarged aperture of the clevisarm 2. Such an arrangement is also shown in Figure 5, which differs fromFigure 4 in that a shoulder I5 is provided on the pin shank.

Ifdesired, the spiral spring shown in Figures I to 5 may be replaced bya dished metal spring I'I which is formed with a central aperture I8 toenable it to be passed on to the pin 4. A system of radial slits I9extend from the said aperture so that the spring may be passed over thecollar I3 and engage the peripheral groove, or neck I4. y

Having described our invention what we claim and desire to secure byLetters Patent is:

1. A clevis joint comprising a bifurcated clevis on the end oi' one rod,a second rod having an eye in oneend thereof, a pin jointing the saideyed end .in the clevis and a spring disposed around the pin andstressed between a clevis arm and the eyed end, the said spring beinganchored to the said pin.

2. A clevis Joint comprising a bifurcated clevis on the end of one rod,a second rod having an eyed end, a headed pin iointing the eyed end inthe clevis, a stressed spring around the said pin between one side ofthe clevis and the said eyed end, the said clevis side having anaperture of sumcient diameter to allow passage of the springtherethrough, the head of said pin closing the said aperture when saidheaded pin is inserted in the clevis.

3. A clevis joint comprising a bifurcated clevis on the end of one rod,a second rod having an eye in one end, a pin jointing the eyed end inthe clevis, the said pin being surrounded by a spring anchored thereto,and embodying a head or plug which normally closes an aperture in oneescasos side oi the clevis which is of suicient .diameter to permit othe passage therethrough or" the spring.

e. A clevis joint comprising a lbiiurcated clevis on the end of one rod,a second rod having an eye in one end thereof, a pin jointing the eyedend in the clevis, and a stressed spring around the pin and acting onthe said eyed end, the said pin having an annular groove adjacent itshead, the -spring being anchored in the said groove.

Y 5. A clevis joint comprising a bifurcated clevis on the end of onerod, a second rod having an eye in one end thereof, a pin jointing theeyed end in the clevis and a spring around said pin and acting on thesaid eyed end, the said pin having a head and a portion of enlargeddiameter, said enlargement being so located so as to produce an annulargroove adjacent the rhead wherein the spring is anchored.

6. A clevis joint comprising a bifurcated clevis on the end of one rod,a second rod having an eye in one end thereof, a pin jointing the saideyed en in said clevis, and a stressed spring disposed around the pinand acting on the said eyed end, a head on the pin and a radial stud onthe said head, one arm of the clevis having an aperture for receivingthe pin head and the wall of the aperture having a bayonet slot forreceiving the stud so as to lock the pin in the clevis.

'7. A clevis joint comprising a bifurcated clevis on the end of one rod,one side of said clevis having a tapped aperture therein, a second rodhaving an eye on one end, a pin jointing the eyed end in the clevis, anda stressed spring around the pin and between the apertured side of theclevis and said eyed end, said pin having a head provided withperipheral threads adapted to engage saidv tapped aperture in said oneside of the clevis.

8. A clevis joint comprising a bifurcated clevis on the end of one rod,a second rod having an eye in one end, a pin jointing the eyed end inthe clevis, and a spring surrounding said pin and anchored thereto andacting on said eyed end, said pin having a head engaging one side of theclevis and having a peripheral shoulder adjacents its end remote fromthe said head for engaging the other side of the clevis to limit thelongitudinal movement of the pin in the clevis.

FRANCIS NORMAN DUFFIELD. PATRICK- JAMES HARGREAVES RUBY.

